dijkstra - single-source distance filter


   dijkstra [ -adp?  ] [ sourcenode file ]


   dijkstra reads a stream of graphs and for each computes the distance of
   every node from sourcenode.  Edge length is given in the len attribute,
   and  the  default is 1.  The dist attribute of every node is set to its
   distance from sourcenode.  If the -p flag is used, the  prev  attribute
   of  each  node  reachable  from  sourcenode  is  set to the name of the
   previous node on a shortest path.  The graph attribute maxdist  is  set
   to the maximum dist of all nodes in the graph.

   If  the  -d  flag  is  used,  the graph is treated as directed and only
   forward edges are used.

   By default, if the graph is disconnected, the dist attribute  of  nodes
   unreachable  from  sourcenode are left untouched, and maxdist is set to
   the maximum of any previous value and the largest distance recorded  in
   this run. On the other hand, if the -a flag is used, the dist attribute
   of an unreachable node is assigned a  very  large  value,  and  maxdist
   records   the  maximum  distance  found  in  the  component  containing

   Any number of sourcenode file pairs may be given.  If the last file  is
   missing, stdin is used.  All output is written to stdout.

   In  a  typical  application,  dist  and  maxdist can drive a downstream
   calculation of color or some other attribute.


   gvpr(1), gvcolor(1), libgraph(3)

                             21 March 2001                     DIJKSTRA(1)


Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.

Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.

Free Software

Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.

Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.

Free Books

The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.

Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.


Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.

Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.